Josh Betz

A simple plugin that allows blog owners on a multisite network to use a custom favicon by uploading it to the root of their theme directory. Ideal for people who host clients on their own multisite install or want to run multiple domains off of one install.

Network Favicons

Allows blog owners to use a custom favicon just by uploading it to the root of their theme directory.

epipe-com

This plugin adds a favicon link to the document head section.
There are no options. The link is always added when the plugin is enabled.
The <code>favicon.ico</code> file needs to be uploaded to the site’s root 
directory. If you do not know how to do this, you should have a look at 
one of the other favicon plugins.

The Simplest Favicon

Adds a favicon link to the document head section.

Network Favicons vs The Simplest Favicon